Okay, I'll just remember every turning I'm supposed to make on a 3 hours journey.
Its a very strange thing, we all managed perfectly well doing just that! I don't have or need t*** nav in spite of the fact I travel around 28,000 miles a year, go looking for airfields that are usually very remote and well hidden. I don't get lost, and I can listen to the radio and work my way round traffic problems.
Or maybe I should have the map open on the passenger seat, or even better on my lap/over the steering wheel like I've seen some people try and do.
No, again, you don't need to do any such thing. if you can't remember the route, plan a stop. It's oh so simple!
Having it on the windscreen (but noway near the middle) means it can be looked at with a quick glance - akin to looking down at your speedo or mirrors.
Anything on your windscreen reduces your visibility. If you must use them, the dammed things talk, you don't need them in view. Besides I am talking about the numbskulls who have them slap bang in front of them, something I keep seeing.
Most sat navs have a night mode though which is much less bright - changes to a black & green colour scheme rather than pale grey and bright blue.
Its a shame too many people don't use it then!
I'm sorry, but t*** nav whether its people messing with it when they shouldn't be, or having it reduce visibility is a dangerous thing. Yes, used properly it's OK, ish. But like mobiles, people suddenly can't live without seeing it, or messing around with it. It's become a self licking lollipop which people fall over themselves to justify the use of when they should be concentrating on driving.